-LRB- CNN -RRB- -- Chinese authorities in eastern Jiangsu Province have launched a massive manhunt for a suspect in a deadly armed robbery , according to Chinese media .

The suspect allegedly shot and killed a man who had just withdrawn 200,000 yuan -LRB- $ 31,700 -RRB- from a bank in Nanjing 's Dongmen Street on January 6 and then fled the scene in a car , China 's state-run Xinhua news agency reported .

Nanjing Public Security Bureau 's Xuanwu district office told CNN that more than 80,000 police have joined the manhunt , while a reward of 150,000 yuan has been offered for information leading to the killer 's arrest .

Authorities believe the suspect -- a man in his early 40s from Sichuan province called Zeng Kaigui -- is also responsible for shooting dead six others in six robberies in Changsha and Chongqing municipality over the past seven years .

Nanjing police have obtained two video clips of the suspect escaping the scene and published them online , and said Zeng is of medium build and wears black outfits during the robbery .

Police have posted Zeng 's profile picture in public places like subway stations and Internet cafes , and have handed them out to taxi and bus drivers throughout the c

Many big screens in downtown Nanjing are also showing the suspect 's video clips hourly with police warnings to citizens .

CNN 's Shao Tian contributed to this report .

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Massive search launched for killer who robbed a man of $ 31,700

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More than 80,000 police have joined the manhunt for the suspect in Nanjing

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Police have obtained two video clips of the suspect escaping the scene

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The robber is believed to have killed at least six others throughout China